The answer is wavelength. It is the distance between corresponding points of two consecutive waves (corresponding points are particles or points in the same phase, meaning the points have completed identical fractions of their periodic motion. In a transverse wave it is the distance between two successful crests or troughs while in a longitudinal wave is the distance between two successful compressions or rarefactions.
        
             
        
        
        
D, The cell take in water and food some of the food dissolve to create other things for the cells and they have structures that perform to help us survive.
        
             
        
        
        
Answer:
The correct answer is - Pons.
Explanation:
The pons is located t below the midbrain and below the midbrain. It is a group of nerves that function as a connection between the cerebrum and cerebellum.
It is related to the various functions of the body such as sleeping, respiration, swallowing, bladder control, hearing, and many more. These functions 
 
        
             
        
        
        
Answer is in the attachment.